The 2D top view of the droplet formation in microfluidic T‐junction devices with a neck is recorded to estimate the droplet volume under different flow conditions. The channel with a neck at the T‐junction, to provide a narrow structure, is proposed but has not been analyzed as the normal T‐junction. The droplet generation process is separated into two stages, including the filling stage and the squeezing stage, to develop a droplet size predictive model based on the continuity of both liquids. In a wide range of flow conditions for multiphase microfluidics, this study validates and physically explains the model by analyzing the generation of droplets and coefficients of the model. Results of this study can help to design droplet microfluidic devices, where it is requisite to know the relation between flow conditions and the droplet size.

中文翻译：

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带颈部的T型接头微通道中不同流速下的液滴产生

记录带有颈的微流体T型结装置中液滴形成的二维顶视图，以估计不同流量条件下的液滴体积。提出了在T型接头处带有颈部的通道，以提供狭窄的结构，但尚未作为正常的T型接头进行分析。液滴的产生过程分为两个阶段，包括填充阶段和挤压阶段，以基于两种液体的连续性建立液滴尺寸预测模型。在多相微流体的各种流动条件下，本研究通过分析液滴的产生和模型系数来验证模型并对其进行物理解释。这项研究的结果可以帮助设计液滴微流控设备，其中必须了解流动条件与液滴大小之间的关系。